All elements being incorporated in the timeline of a project have the default name of the imported original file –or the name of the interactivity or complement if it is an interactive element–, this name is assigned on the element label, which is later visible on the timeline an the list of layers to make its detection easier.
The name of this Label can be edited at any time from the Settings panel: it is the first parameter within the general Submenu. No matter when or how many times you change the label, the name is automatically updated in the timeline and in the list of layers.
If you want to change the file name (though not its label), you can make it from the first field within the Info tab. Once you have changed the file name from here, the name will not only change in the timeline, but also in the Library.